Shape optimization of quantum-dot caps for high color-rendering white light-emitting diodes studied by optical simulation

Lee, Jung-Gyun; Lee, Gi Jung; Hong, Sung-Hwa; Ko, Jae‐Hyeon; Park, Taehee; Ko, Young-Jo

doi:10.1007/s40042-021-00072-8

Cited by 8 publications

(6 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In horticulture, LED fixtures usually combine red, blue, white, and far-red LEDs; in the case of white LEDs, due to their widespread usage, their fraction can increase to more than 60% of the total LEDs [28]. A well-known method for producing white LEDs is the combination of yellow-emitting yttrium aluminum garnet (YAG) phosphor and blueemitting LED chips, but this kind of white LED lacks the wavelength of strong red, which is mainly used for photosynthesis [29,30]. Recently, quantum dot (QD) materials were applied in white LEDs to increase the strong-red wavelength, and they were applied in blue LEDs to obtain the blue, red, and far-red wavelengths to provide potential application value for agricultural production [29,30].…”

Section: Introductionmentioning

confidence: 99%

Effect of Supplemental Inter-Lighting on Paprika Cultivated in an Unheated Greenhouse in Summer Using Various Light-Emitting Diodes

Kwon

Lee

Roh

et al. 2023

Plants

View full text Add to dashboard Cite

This study investigated the effects of supplemental inter-lighting on paprika (cv. Nagano RZ) in South Korea in summer using various LED light sources. The following LED inter-lighting treatments were used: QD-IL (blue + wide-red + far-red inter-lighting), CW-IL (cool-white inter-lighting), and B+R-IL (blue + red (1:2) inter-lighting). To investigate the effect of supplemental lighting on each canopy, top-lighting (CW-TL) was also used. Additionally, a control without supplemental lighting was included for comparison. Significant variations were observed in the plant growth indexes 42 days after treatment. The SPAD values and total chlorophyll content in the last period of cultivation were significantly higher than those of the control. In November, the marketable fruit yield was significantly higher than that of the control. QD-IL, CW-IL, and CW-TL resulted in significantly higher values of total soluble solids than the control, and CW-IL resulted in higher values of ascorbic acid content than the control. Regarding the economic analysis, CW-IL resulted in the highest net income rate (12.70%) compared with the control. Therefore, the light sources of CW-IL were assessed as suitable for supplemental lighting due to the highest total soluble solids, ascorbic acid content, and net income rate obtained.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of Supplemental Inter-Lighting on Paprika Cultivated in an Unheated Greenhouse in Summer Using Various Light-Emitting Diodes

Kwon

Lee

Roh

et al. 2023

Plants

View full text Add to dashboard Cite

show abstract

“…In our previous studies, either QD films or QD caps have been incorporated into conventional white LED lighting devices to improve the color-rendering properties [ 39 , 40 , 41 , 42 ]. In particular, the position of each QD component has been optimized by evaluating the optical characteristics of the white LEDs.…”

Section: Introductionmentioning

confidence: 99%

Color Rendering Index over 95 Achieved by Using Light Recycling Process Based on Hybrid Remote-Type Red Quantum-Dot Components Applied to Conventional LED Lighting Devices

Baek,

Kim,

Kim

et al. 2023

Nanomaterials

Self Cite

View full text Add to dashboard Cite

Red color conversion materials have often been used in conventional white LEDs (light-emitting diodes) to enhance the insufficient deep-red component and thus improve the color-rendering property. Quantum dots (QDs) are one of the candidates for this due to their flexibility in controlling the emission wavelength, which is attributed to the quantum confinement effect. Two types of remote QD components, i.e., QD films and QD caps, were prepared and applied to conventional white LED illumination to improve the color-rendering properties. Thanks to the red component near 630 nm caused by the QD components, the color rendering indices (CRIs) of both Ra and R9 could be increased to over 95. It was found that both the diffusing nature of the reflector and the light recycling process in the vertical cavity between the bottom reflector and the top optical films play important roles in improving the color conversion efficiency of remote QD components. The present study showed that the proper application of remote QDs combined with a suitable optical cavity can control the correlated color temperature of the illumination over a wide range, thus realizing different color appearances of white LED illumination. In addition, a high CRI of over 95 could be achieved due to the sufficient excitation from fewer QDs, due to the strong optical cavity effect.

show abstract

“…White light-emitting diodes (WLEDs) have become one of the fundamental sources of lighting technology nowadays [1][2][3]. As lighting consumes about 20% of worldwide energy [4,5],…”

Section: Introductionmentioning

confidence: 99%

High Colour Rendering Index and Warm Emission of Conventional White-Led Capped with Metal-Phthalocyanine/Cdse Nanocomposites

Elkalashy

Ibraheem²,

Said³

et al. 2023

Preprint

View full text Add to dashboard Cite

Shape optimization of quantum-dot caps for high color-rendering white light-emitting diodes studied by optical simulation

Cited by 8 publications

References 21 publications

Effect of Supplemental Inter-Lighting on Paprika Cultivated in an Unheated Greenhouse in Summer Using Various Light-Emitting Diodes

Effect of Supplemental Inter-Lighting on Paprika Cultivated in an Unheated Greenhouse in Summer Using Various Light-Emitting Diodes

Color Rendering Index over 95 Achieved by Using Light Recycling Process Based on Hybrid Remote-Type Red Quantum-Dot Components Applied to Conventional LED Lighting Devices

High Colour Rendering Index and Warm Emission of Conventional White-Led Capped with Metal-Phthalocyanine/Cdse Nanocomposites

Contact Info

Product

Resources

About